State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, Jiangsu, China.
Water Sci Technol. 2013;67(11):2412-7. doi: 10.2166/wst.2013.094.
Secondary-treated municipal wastewater (MWW) could supply a viable alternative water resource for cooling water systems. Inorganic salts in the concentrated cooling water pose a great challenge to corrosion control chemicals. In this study, the inhibition effect of 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP), trimethylene phosphonic acid (ATMP) and 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) on corrosion of carbon steel in secondary-treated MWW was investigated by the means of potentiodynamic polarization and electrochemical impedance spectroscopy. The inhibition effect increased with increasing concentration of inhibitors. The corrosion rates of carbon steel were 1.5, 0.8, 0.2 and 0.5 mm a(-1) for blank, HEDP, ATMP and PBTCA samples at 50 mg L(-1), respectively. The phosphorus-based chemicals could adsorb onto the surface of the carbon steel electrode, form a coat of protective film and then protect the carbon steel from corrosion in the test solution.
二级处理城市污水（MWW）可以作为一种可行的替代水冷系统水源。浓缩冷却水中的无机盐对腐蚀控制化学品构成了巨大挑战。在这项研究中，通过动电位极化和电化学阻抗谱研究了 1-羟基亚乙基-1,1-二膦酸（HEDP）、三亚甲基膦酸（ATMP）和 2-膦丁烷-1,2,4-三羧酸（PBTCA）在二级处理 MWW 中对碳钢腐蚀的抑制作用。抑制剂浓度的增加，抑制效果也随之增强。在 50mg/L 时，碳钢的腐蚀速率分别为空白样、HEDP 样、ATMP 样和 PBTCA 样的 1.5、0.8、0.2 和 0.5mm/a。磷基化学品可以在碳钢电极表面吸附，形成一层保护膜，从而防止碳钢在测试溶液中腐蚀。
